Note: a printable version is available at the bottom of the page.

Introduction:

• All AIRSYS lead/lag controllers can gain additional functions and improvements by upgrading the control software.
• This software upgrade requires a Smart Key loaded with newest software. The Smart Key is available from AIRSYS to service contractors and customers to perform field software upgrades and can be loaned for up to 90 days without charge. For more detail, please contact ASNSupport@air-sys.com
• Software upgrade resets all parameters to factory default.

I: Install Temp Sensors

Note: Skip to Step 2 if Supply Air Temp. Sensors already installed.

1. For both HVAC units, mount the supply air temperature sensor to the supply air grill (Figure 1).
2. Connect the sensor to the B1 and GND terminals on the corresponding controller module (Unit 1 to HVAC1, Unit 2 to HVAC2). See Figure 3 for wiring.

          Figure 1

II: Upgrade Unit #2

Note: Unless stated otherwise, all references in this section refer to the unit 2 controller module (labelled HVAC2).

1. Disconnect J1 and J6 (Figure 3).
2. Insert Smart Key into J5.
3. Move J7 from Unit #1 (HVAC1) to Unit #2 (HVAC2). See Figure 3 for connector locations.
4. Reconnect J1.
5. Wait until the arrow shaped indicator light on the Smart Key is steady green (see Figure 4).
6. Press “Start” on the Smart Key. The arrow will flash with increasing frequency while the software is loading. A “chirping” sound indicates the software has finished loading.
7. Remove the Smart Key.
8. Reset the controller by disconnecting and reconnecting J1 power.
9. The screen will display EO. After ~15 seconds, the display will change to 0.0.
10. Press Up to scroll to Set
11. Press Down and Sel together. If done correctly, a flashing 0 will appear on the display, otherwise press Up and Down together to return to step 10.
12. Press Sel, Stp should appear.
13. Press Up to scroll to DEF. Press Sel. The screen should display OFF.
14. Press the Up button and the correct indoor temperature should be displayed. If the display still reads 0.0 after 30 seconds, return to step 9.

                                           Figure 3

III: Upgrade Unit #1

Note: Unless stated otherwise, all references in this section refer to the unit 1 controller module (labelled HVAC1).

1. Disconnect J1.
2. Insert the Smart Key into J5.
3. Move J7 from unit #2 to unit #1 (See Figure 2).
4. Repeat steps 4-14 from Section II for the Unit #1 controller.
5. Reconnect J6 on unit #2.

                                        Figure 4

IV: For DC Controllers (ASLLC.2(A).48) ONLY

Skip to Section V unless the controller is 48 VDC (model ASLLC.2(A).48)

1. From the indoor temp display, press Up to scroll to Set.
2. Press the Up and Sel buttons together. If done correctly the screen will display TES. Otherwise press Up and Down together to return to step 1.
3. Press Up until the terminal displays SF1 and press Sel.
4. Press Up to change 1 to 0 and press Sel.

V: Step Test - Verify Proper Operations

1. Turn the controller breaker (QF1) off. Wait 5 Seconds and turn it back on.
2. The screen will display EO. After ~15 seconds, the display should display the indoor temperature.
3. Hold Up and Sel together for 3 seconds, the display should change to COD.
4. Press Sel. The current step should be displayed (Default 0). Use Up or Down to change the step and press Sel to confirm. Once confirmed, the screen will revert to COd and selected step will start.
5. All steps listed in Table 1 should be completed to verify operation

Video Instructions for Step Test:

VI: Turn System ON (Automatic Mode)

1. Press Up and Down together to get back to the Indoor Temperature.
2. Press Down to find OFF
3. Hold Sel for 3 seconds. Both up and down buttons should be lit and active alarms will be displayed if there is any. Refer to the WPU Troubleshooting Guide for alarm troubleshooting.
4. Press Up and Down together to get back to the Indoor Temperature.

Video Instructions for Turning the System On: